高铁车轴用EA4T钢的高周疲劳破坏行为  

High-cycle Fatigue Behavior of EA4T Steel for High-speed Railway Axle

作　　者：胡芳忠[1] 汪开忠[1] 惠卫军[2] 张永健[2] 陈世杰[1] 于文坛[1] Hu Fangzhong;Wang Kaizhong;Hui Weijun;Zhang Yongjian;Chen Shijie;Yu Wentan(Ma'anshan Iron&Steel Co.Ltd.,Ma'anshan Anhui,243000,China;Beijing Jiaotong University,Beijing,100044,China)

机构地区：[1]马钢股份公司,安徽马鞍山243000 [2]北京交通大学,北京100044

出　　处：《安徽冶金科技职业学院学报》2024年第4期8-11,19,共5页Journal of Anhui Vocational College of Metallurgy and Technology

摘　　要：采用旋转弯曲疲劳实验和疲劳裂纹扩展实验研究了不同回火温度和取样部位对高铁车轴用EA4T钢疲劳破坏行为的影响。研究结果表明,由于实验钢的淬透性及车轴尺寸的影响,EA4T实验钢制车轴表面的组织为高温回火马氏体加少量贝氏体,而1/2半径处的组织则为贝氏体加少量高温回火马氏体。这种组织上的差异导致了拉伸性能和疲劳性能的差异,具体表现为车轴表面附近的强度略高于1/2半径处,且表面附近的疲劳性能优于1/2半径处。此外,降低实验钢的回火温度可以显著提高其强度和疲劳强度,并在一定程度上降低了应力强度因子范围ΔK较低时的裂纹扩展速率。The fatigue fracture behavior of EA4T steel for high-speed railway axle with different tempering processes and sampling locations was studied using rotating-bending fatigue test and fatigue crack growth(FCG)test.The results showed that due to the influence of the hardenability of the experimental steel and the size of the axle,the surface microstructure of the EA4T experimental steel axle is tempered martensite with a small amount of bainite,while the microstructure at half the radius is bainite with a small amount of tempered martensite.This difference in microstructure leads to variations in tensile properties and fatigue properties,specifically showing that the strength near the axle surface is slightly higher than that at half the radius,and the fatigue performance near the surface is better than at half the radius.Additionally,lowering the tempering temperature of the experimental stel can significantly.

关 键 词：车轴钢 EA4T钢 高周疲劳 疲劳裂纹扩展速率 热处理工艺 

分 类 号：TG142.1[一般工业技术—材料科学与工程] U260.4[金属学及工艺—金属材料] U270.41[金属学及工艺—金属学]